Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Qinduan Zhang"'
Recent advances in laser gas sensors for applications to safety monitoring in intelligent coal mines
Autor:
Weihua Gong, Jie Hu, Zhaowei Wang, Yubin Wei, Yanfang Li, Tingting Zhang, Qinduan Zhang, Tongyu Liu, Yanong Ning, Wei Zhang, Kenneth T. V. Grattan
Publikováno v:
Frontiers in Physics, Vol 10 (2022)
Due to the extremely complex working conditions, various health and safety hazards are present in underground coal mines, which cause economic losses and heavy casualties. Among these hazards, methane gas explosion and coal combustion are recognized
Externí odkaz:
https://doaj.org/article/c5ebfd8bcc44440baa2643bf8741c0e8
Autor:
Shoulin Wang, Weihua Gong, Zhaowei Wang, Yubin Wei, Yanfang Li, Tingting Zhang, Qinduan Zhang, Lin Zhang, Fugang Song, Wei Zhang, Tongyu Liu
Publikováno v:
Frontiers in Physics, Vol 10 (2022)
Owing to interference fringes in the multireflective gas cell, the detection sensitivity of a system in tunable diode laser absorption spectroscopy (TDLAS) will decrease significantly. In this work, a combined scheme of complete ensemble empirical mo
Externí odkaz:
https://doaj.org/article/7efc2a62587048deb779a50e6e7453b8
Autor:
Qinduan Zhang, Jie Hu, Yubin Wei, Binkai Li, Guancheng Liu, Tingting Zhang, Zhaowei Wang, Weihua Gong, Tongyu Liu
Publikováno v:
Photonics, Vol 10, Iss 1, p 95 (2023)
A compact and low-power-consumption gas sensor using a quantum cascade laser (QCL) emitting at 4.6 μm for measurement of carbon monoxide (CO) was proposed and experimentally demonstrated. A compact sensor structure with a physical dimension of 14 ×
Externí odkaz:
https://doaj.org/article/3f738f4e03f949e3bf53d058855d5edc
Publikováno v:
Metals, Vol 13, Iss 1, p 59 (2022)
Laser cleaning is a good alternative to ablate and remove contaminants from different samples. To meet the practical demand, we present the elemental analysis of Q235 steel samples, using laser-induced breakdown spectroscopy (LIBS) to enhance the las
Externí odkaz:
https://doaj.org/article/8e89ebc950af4409b55db2e88c17e59b
Publikováno v:
Photonics, Vol 9, Iss 6, p 412 (2022)
A noise elimination method based on an improved particle swarm algorithm is applied to direct absorption spectroscopy. The algorithm combines the theory of spectral line shape to calculate a fitness function according to the original spectra. Compari
Externí odkaz:
https://doaj.org/article/5c8f9e4e83254535bd8f570720602a06
Autor:
Zongliang Wang, Jun Chang, Huishan Yu, Cunwei Tian, Hao Zhang, Xiukun Zhang, Longfei Tang, Qinduan Zhang, Yiwen Feng
Publikováno v:
Photonic Sensors, Vol 9, Iss 4, Pp 376-387 (2019)
Abstract Multi-component and multi-point trace gas sensing in the wavelength modulation spectroscopy is demonstrated based on the frequency-division multiplexing and time-division multiplexing technology. A reference photodetector is connected in ser
Externí odkaz:
https://doaj.org/article/0d6d53821c784a50b34080f01eed3c47
Autor:
Yulei Xie, Jun Chang, Xiaohan Chen, Jiachen Sun, Qinduan Zhang, Fupeng Wang, Zhiwen Zhang, Yiwen Feng
Publikováno v:
IEEE Photonics Journal, Vol 11, Iss 3, Pp 1-8 (2019)
The temperature fluctuations inside commercially distributed feedback laser diode were experimentally measured and analyzed in detail in this study. In tunable diode laser absorption spectroscopy based gas sensing systems, the temperature of the lase
Externí odkaz:
https://doaj.org/article/fb77ebd5f5024d15b3ed5928bd7aaea6
Publikováno v:
Photonic Sensors, Vol 8, Iss 4, Pp 358-366 (2018)
Abstract A simple and effective wavelength calibration scheme is proposed in a quartz enhanced photoacoustic spectroscopy (QEPAS) system for trace gas detection. A reference gas cell is connected an InGaAs photodetector for detecting the absorption i
Externí odkaz:
https://doaj.org/article/196b026e495c422ea83dd13c4700fca4
Publikováno v:
Photonic Sensors, Vol 8, Iss 2, Pp 127-133 (2018)
Abstract Preamplifier circuit noise is of great importance in quartz enhanced photoacoustic spectroscopy (QEPAS) system. In this paper, several noise sources are evaluated and discussed in detail. Based on the noise characteristics, the corresponding
Externí odkaz:
https://doaj.org/article/19a80669f13b448292dd6a348ec0d09e
Publikováno v:
IEEE Photonics Journal, Vol 10, Iss 6, Pp 1-8 (2018)
A multi-gas quartz enhanced photoacoustic spectroscopy (QEPAS) sensor based on three quartz tuning forks (QTFs) with different response frequencies for trace gas detection was proposed and experimentally demonstrated. Three near-infrared DFB lasers a
Externí odkaz:
https://doaj.org/article/c471f2ed63744d1f8fddf7ea09f3c4f0